Is there a quick fix to the problem with the Honda NX500 

Exaust and emissions controls have been tightened up a lot with the latest Euro 5 regulations. E.g. midpipes welded to the cat to prevent replacement. Its probably related to emissions in some way and a result of the aftermarket exhaust. But I'm guessing.

I had this at 100 miles. On some early imports the ecu was programmed for the far east fuel which apparently because of the hotter climate is a different grade to uk petrol the bike thinks it’s getting bad fuel. My ecu was flashed at the 600 mile service and it’s been fine ever since

I have the same bike, same exhaust and same issue. I reset it using an adapter and OBD2 reader and it just comes back after a 100 miles or so. Get the same O2 sensor fault code P0139 (Slow Response) and P0420 (efficiency below threshold). Dealership said it was the aftermarket exhaust and strict Euro5+ causing the repeated engine light. I’m just living with it to be honest. If I ever sell it, I’ll just put the stock exhaust back on.

Hopefully it is just a blip Andrew. Safe riding out there.

Is the exhaust a full system? When fitting the new exhaust did you have to remove and reinstall the O2 sensor? Normally that kind of error is cause by a faulty O2 sensor or it could also be a slight blow is sucking in air when on idle, this will read as higher oxygen than expected, giving the fault. Check the headers and gaskets are seated correctly.

I had the same issue on my new triumph 400x. Took it in. They reprogrammed the software. It's fine so far.

Any updates on this error code? Is it definitely exhaust related? Is there a solution? Hard to understand how just an end can could affect the emissions when the cat and O2 sensors are upstream and should be affected at all by the shape of the muffler alone. I do hope it's something else entirely. I don't care about a can for sound or performance reasons. I just HATE the way modern bike manufacturers over style the muffler, and harken back to days of old when they were simple round or oval cans, The aftermarket cans just look SO much better to my eye. At 60, I'm considering my "retirement bike". Been riding since 11, and have run the gamut from fast sport bikes, classic bikes, big adventure bikes, etc. But, in recent years have rediscovered the simple JOY of riding when I switched back to smaller machines. Currently have 15 bikes in the garage (not all rideable by any means), including a KTM 390 Duke, KTM 390 Adventure, and a Himalayan 411, all of which are splendid for what they are and do. However, with retirement plans including some actual long distance trips I'm looking for a bit more long legs and longevity/reliability, while still trying to keep the weight and overall size down. The CB/NX looks like it just may be the ticket for a long term bike that I can trust a bit more than maybe I do the KTMs.... Really enjoying hearing/seeing your experiences and thoughts on these bikes. Thanks for the videos. Just subscribed!

MrFish had the same issue with his NX500 after fitting an aftermarket exhaust. He got it reset and hasn't had it pop up since

Normally you should have the ecu tuned when modding engine components.

saves me buying an aftermarket exhaust... was gonna be one of the last things I do to it anyway... after crash-bars, luggage and a clip-on windscreen extender.

If the fater market exhaust is is not sealed where it is connectet to the bicke then you might get problems. Hopes it get solved.

If the Scorpion exhaust does not meet Euro 5 Regulations, how in the UK do you get a MOT if the exhaust is non-compliant? should the aftermarket exhaust companies be building exhaust that meet the required regulations, then you would not be getting this issue. Here in NZ we don't have these regulations, but the bikes still arrive with Euro Emission standards.

Glad all's well, would be nice if we could read the fault codes ourself on the computer screen connected to the bike!

try disconnect the negative terminal of the battery? then a few sec ot will reset maybe

This is exactly why I’m buying a thumper tenere with nothing on it at all. The modern world ever fuller of ai shite

I dont think it's anything to do with the aftermarket exhaust. I put a Black Widow on mine, no problem.

How did they clear the fault? Handy to know if mine gets the same fault. Thanks.

Refit the stock exhaust and see if the fault goes away?

Mine came on when I fitted a scorpion on my cb500x. I didn’t use it for a couple of weeks and it reset itself and has never come back on .

From what it’s saying it must be something related to the exhaust.

Mines doing exactly the same .. different exhaust same problem ..

it cant possibly be the after market exhaust installation when were talking about an O2 sensor, THE BIKE MUST HAVE A PROBLEM 😂 cool looking footpegs tho

I wonder if this is to do with the NX500 being a Euro 5a machine.

Honda have just under 3yrs to fix this before the bike fails the MOT. It should be sorted well before then. 🤞

Hi - Can you please tell me the diameter of the bar which held your GPS, i am buying a GMS mount and would appreciate if you let me bar diameter. Thank you

I have a suggestion. Trade it in for a CB500X! Simples 😂

Maybe swap to the original exhaust and see if the problem goes away. Personally I prefer not to give the rozzers advance notice that I'm coming!

Your mic is picking up heaps of noise i think you need a fuzzy mic its very hard to hear what you are saying great content though...i live in Asia and have 3700km on my NX and have not have had this issue btw.My dealer did say when you switch the key on and the dash lights up to wait until the full screen is illuminated before you turn the key or you might get the trouble light on.b That way the ECU can do its full engine check before you turn the motor over. I had this problem on my Triumph400X it actually failed to start one time it needed a tow to the dealership due to not waiting for the engine to cycle through its checks.

Was it fixed?

Was this sorted in the end for you mate?

Who wrote it a 5 year old could do better. It,s scribble.

If it’s got a decent ecu it will cope with the exhaust.

PGM-FI is self diagnostic

Dump that exhaust! Problem solved. Oh and dump that quad lock if you still want your phone camera to work later on. They kill phone cameras.

You will have to get rid of it when the warranty expires - honda will fob you off till then !!!

I think Mrfish maybe has the same problem with his NX500